protected cl_image_format getImageFormat() {
/*cl_image_format f=new cl_image_format();
f.image_channel_order=CL.CL_R;
f.image_channel_data_type=CL.CL_UNORM_INT8;*/
cl_image_format f=new cl_image_format();
f.image_channel_order=CL.CL_LUMINANCE;
f.image_channel_data_type=CL.CL_FLOAT;
return f;
}